One and a half minus one-third plus five seventh and minus five seventh plus two-thirds

1+1/2-1/3+5/7-(5/7+2/3)=1/2

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1. 1 / one and a half / one and a third / one and a quarter / one and a nineteenth I really can't. I have to go to class later!
2. -(- one and half) reduction
3. Nine to six, one and a half () It's a judgment question. If it's wrong, say why
4. What's minus one and half plus half
5. (- one third and one half) / (- one and one half) × one third and one third
6. [31 + (10.4-2.4) x2.215] △ 2.5 =? One and a half [(2.25 + four and a sixth) x 77] minus one and a thirteenth =?
7. Negative 16 and 3 / 4 - negative 10 and 1 / 4 - positive 1 / 2 =?
8. Minus three quarters divided by minus one and half divided by minus one fourth
9. -One and a half ／ three quarters ／ (- 0.05) × (- one and three quarters)
10. What does three quarters multiply by two mean?
11. The absolute value formula of the number less than minus two fifths and minus one half
12. (superspeed) solve the quadratic equation of one variable x2 + 2mx + 2 = 0 with respect to x, and point out the value of M2
13. Using the collocation method to solve the quadratic equation of one variable X2 (that is the square of x) + 2mx + N2 = 0 Try to prove that the equation (m2-8m + 17) x2 + 2mx + 1 = 0 about X is a quadratic equation with one variable no matter what the value of M is
14. Solving mathematical problems -- given that X-1 is the root of quadratic equation x2 + MX + n = 0, then the value of M2 + 2Mn + N2
15. If / M + 1 / + (n-2) 2 = 0, then the root of the original equation (m2-3m-4) X2 - (N2 + 4) X-1 = 0 is /M + 1 / / is the absolute value sign
16. (m2-n2) (m2-n-2) - 8 = 0, then the value of m2-n2 is
17. Given that sin θ and cos θ are two of the equations 5x ^ 2-x + 5m = 0 about X, find the value of real number M
18. Known vectors M1 = (0, x), N1 = (1,1), M2 = (x, 0), N2 = (y ^ 2,1) Let m = vector M1 + radical 2, vector N2, n = M2 - radical 2, vector N1, and m ‖ n, the locus of point P (x, y) is curve C (1) Let the line L: y = KX + 1 intersect with the curve C at two points a and B. If AB = (4 radical 2) / 3, the equation of the line l can be obtained
19. One mole of O2 and two moles of N2 are mixed to calculate the average molecular weight of the mixed gas
20. T. P same: V1: V2 = N1: N2 Who can help me write down the derivation process of this chemical formula P * m / ρ = RT * m / m what's going on?